Valve-refacing tool



Jun 7, 1927.

. L. O. BEARD VALVE REFACING TOOL Filed Oct. 9, 1926 l/we/ for' W QM Patented June 7, 1927.

nawssnca o, mum. is macaw, BEN SYW I'A- mmerse T001- Application filed October 9, Serial No. 14 Q,6 13.

vantages of my invention will be apparent i s he pe ficat n s consi e e in an estion with the accompanying drawing, in which:

Figure 1 is a top plan View of the tool;

Figure 2 is a bottom plan view of the same;

Figure 3 is a side elevation;

Figure 4 is a section on the Figure 3;

Figure 5 blade.

Figure 6 is a sectional view taken on the line 66 of Figure 5, and

Figure 7 is a modified form of the cutter bar wherein both edges of the bar may be utilized as a cutting face.

Referring more particularly to the drawings, 1 denotes what may be termed a cutter head, substantially conical in shape and formed at its apex with a cylindrical internally threaded boss, 2. The cutter head 1s line 4- of is a detail view of the cutter also formed with a slot 8 in which a cutter blade 4 is a'djustably mounted in a manner hereinafter described. The blade 4, as disclosed in the drawings, is composed of a steel bar 1, the longitudinal edge of which has a beveled edge l which constitutes the cutting face and upon which a valve face is adapted to rest in a manner hereinafter described. Furthermore, it will be noted that the width of the cutter is substantially greater than the thickness of the cutter head. The valve stem 5 of a valve 6, which the operator desires to reface', is guided in the central bore 8 of a guide bushing 9, which is in turn threadedly mounted in the threaded bore 19 of the cylindrical boss 2 of the cutter head. The blade A also functions to clamp and lock the guide bushing in place and at the same time is supported by the bushing.

In adjusting the cutter blade to proper cutting posit-ion the blade is inserted in the slotBdwith the cutting face of the blade substantially flush with the inner convex face 10 of the cutter head and the other face of, which projects outwardly'of the outer or concave face 11 of'the cutter head. A pair of headed screws 12 screwing into threaded ope1iings'13 formed in the concave face 11, are neat screwed home until the screw heads, which overlap the slot 3, engage the outer faceof the blade adjacent opposite ends thereof and move the blade inwardly transv rsely of theslot, until the cutting edge or the blade protrudes through the slot the desired distance. As" the respective convex'and concave faces 10 and 11 are paralle'land dis posed at an angle of forty-five degrees to the aXisofthe too1,it is abomparatively simple matter for the user to readily determine when the blade is' in proper cutting position by merely placing the forefinger and thumb against the respective faces. After the blade has been positioned as to depth, screw 14:

'threadedly mounted in threaded opening 15 formed in the rim 16 of the cutter head, is screwed home until the head of the screw engages the beveled outer end portion 17 of the blade and holds the blade against longitudinal movement within the slot 3 and with its lower end substantially flush with the threaded bore 19 of the boss 2, it being noted that the inner endof the slot 3, opens into the bore 19. At the same time during the inward movement of the cutting blade its end engages the bushing 9, thus locking the same firmly in place. The lower end of the valve stem guide bushing is slightly beveled so that the bushing will readily clear the beveled corner 21 of the blade and engage the beveled inner end portion 18 thereof.

In practice the user inserts the stem 5 of the valve 6 down through the guide opening or bore 8 in the valve stem guide bushing 9 until thevalve engages or rests upon the cutter blade. The cutter head and valve are then relatively rotated with respect to each other by grasping the stem in a vise and the rim of the cutter head with the right hand, and manually, imparting opposing rotary movement to these parts. During this operation the valve is preferably pulled downwardly against the blade with considerable force to increase the cutting action of the blade.

As disclosed in Figure 7, I have illustrated a modified form of the cutting blade and in Which it will be noted that both ends of the blade are out upon the same angles, thus permitting the insertion of the blade within the cutter head so that either end may engage the bushing, thus presenting a new cutting surface upon the cutting edge of the blade to be engaged by the Work. In this form it will be evident that the life of the cutter will be increasedand that its periods of resharpening willbe very few. Furthermore, when the blade is reversed end to end, a new cutting surface is always presented to the work, excepting at such times when the work engages the intermediate portion of the blade.

' slot.

2. A valve refacing tool I comprising a through the outer open end of said slot, screw positioned at one side of said slot and j tormed with a head for engaging the outer end of said blade for adjusting said blade longitudinally of said slot, and; means for guiding said blade during sa d ad ustment. 3. A valve 'refacmg tool compr sing. a

conical cutter head having an elongated slot therein, a cutter blade adapted for insertion in said slot, headed screws on the opposing concave and convex faces of said cutter head and on opposite sides of said slot, the heads of said screws adapted to engage andhold and guide the blade in said slot, certain of said screws also adapted to adjust the blade longitudinally of the slot, and certain of said screws adapted to adjust the blade transversely of the slot and means for lock in the blade in desired adjusted position.

in testimony whereof'I affix my signature.

LAWRENCE O. BEARD. 

